Water-tube steam-boiler.



' Losanna..

" nir To all whom 'it may concern:

Be it' known that l, GEORGE M. KOHLER, a citizen of the United States,andnresid ingV at Syracuse, in the county of Onondaga and State of NewYork, have invented cer' `tain new and useful Yimprovements inWater-Tube Steam-Boilers, of which the following is a specification.

The figure shown in the drawing is a sectional side eleva-tion, showingmy improved Water tube steam boiler..

The object of myv invention is to produce .a steam boiler having thefollowing important features: 1st: A large percentage of the heatingsurface so arranged as to receive heat directly from the fire byradiation'without the necessity of haying more than one fiue gas outlet.2nd: A large combustion chamber and furnace at the front end of theboiler, having no irebrick arches, with a bank of tubes so arranged asto protect the walls of the furnace from the intense heat of the iire.3rd: The heating surface, as well as the path of the gases and that ofthe water, in such relation with each other as to secure the maximumthermal head, insuring the attainment of the lowest.

possible. temperature of escaping gases.

4th: A bank of tubes, with mud and feed drum, void of water circulationand subject to low temperature, for the deposition .of scale andsediment from the feed water.

Referring to the gure, it is seen that my .i boiler is of the N shapetype, having an upper' front steam and water drum 1, an

'upper rear steam and water drum 2, lower of steam tubes 16,and a bankof water tubes 17. Drumd is connectedto drum 1 by a bank of eithercurved or straight tubes 7, drum 4 is also connected to drum 2 by a bankof either curved or'straight tubes 10, thus forming a V shapedsuperheater space 8, in which -can be placed, and connected tov thesteam drum, and outlet pipes, any form of standard superheater 9. -lDrum3 with the bank of tubes 6 is placed in the position shown for tworeasons,-1st: to increase the boiler heating surface in such a mannerthat enfrenta eration" anoressia. komen, new roert, i

" waren-TUBE STEAM-Bonnin.

n speicanon of Letters Parent. rammen inw; so, 1913 Application filedSeptember 10, 1912. Serial No. 719,6ii6, I

will enable a large amount of heat to enter the tubes by directradiation from the fire and furnace wall. 2nd: to protect the front4wall of the combustion chamber from eX- 60 cessive heat and consequentlarge loss of heat by radiation. n

n order to cause a definite andrapid circulation of walter in the bankof tubes 6, l

employ a bafiie wall 14 placed between the `65 tubes in the mannershown. This bafiie wall protects .one or more rows of tubes in bank 6from the heat of the gases. Th'econtents y of the tubes exposed to thegases consists of part waterA and partv steam, while: the

contents of the protected rows of tubes is all water.-henc'e arapidcirculation takes place in the direction shown by the arrows 18. Inaddition to the circulation produced,

the baiiiewall 14 protects the'front wall 15 75 from the heatof thefurnace gases. Inthis manner radiation losses from the boiler set- Iting isgreatly reduced and a vthinner front wall can be installed.

Another very important and novel feature-,'80 of my boiler is thearrangement of the feed' and mud drum 5, with the bank of tubes 11connecting this drum with the rear steam and water drum 2. The feedwater is fed into the drum 5 and rises very slowly through the 85 i bankof tubes 11, thence to drum 2. The gases from the furnace, after theyhave passed over the tubes 6 and 7, superheater 9, and tubes 10, passdownwardly vover the tubes 11, while the water in the tubes 1190 flows`upwardly in an opposite direction. This is a great advantage, for sincethe gas and water :dow in opposite directions, the maximum thermal headis secured, which gives maximum eiiiciency of heat transmission.Furthermore, it is seen that the coldest feed water comes in contactwith the gases just as they are about to'leave the boiler setting. lThisenables a lower flue gas temperature to be attained than is possiblewith any other arrangement of heating surface. A. still greateradvantage of this feed drum is the fact that the entering feed water isnot heated bruncrdoesit come in contact with any steamer water from thehotter The feed water is heated by 11o in them to evenaslightfthick'ness.

The figure shows my boilervtitted iino'lined grate Stoker 2 0', placedatof thev boiler. lf 4iftnintl conirenie lsirab-l'e this 'Stoker v couldbe plaeed`zat'either or1botli'sides'o The velocityof the risingfeedwater intubes l1 is very low, .as all tubes are heated uni`v ornily, andhence no circulation is produced in this bank ot tubes. Bue to the lowvelocity o-thewater, the scale-and sediment whichl 'is precipitated asthe Water is heat.- ed, is deposited. onthese tubes' or' in the 'uddrum, This is' a great advantage, as it prerents scale vfrom"accumulating inthe tubes l0, 7, or 6. Thesetube's are subjected totemperatures-.andwould' 'become a source orn danger iffscale wereallowed to accumulatey with an the front theboiler. rilheposition oftheSre ir'rel'a#` tion to the tubesgives a very'large ".e f1nibusvtionChanib'e'r'i'for the 'eiiieient eornbtrstibnt thefluel. Anotherstillinore important' Eeature of the arrangen'lent of the'gratel andtube-sis `the `Very large amount 'of'. dire't' heating' surfaceayailable" for the absorption'. 'of heat by radiation :ronithe fire and.the.- I furnace Wall.

Atant feature' and' advantage. ot this beiten; 'For onesquare-.tootfofdirect beat-ing sur- This feonsider'a very impers:

i'ace can absorb .and transmit 'to tle water. as. niucl-inbeat -astenito. fifteen square feet of heating`surface,..wliicii' oan absorbbeat only by contactwith the bot gases;-

E desire t'o call attention to'thefaet 'that .there is `no-eonnefeti'on'between `the 'drums and 5, as in some other-boilers havingwtwovvlower/drinns. xAlso that while `my boiler has an shaped. 'combustionchamber; it has a furnace openingl at. thefront' only and does not 'havethe disidyajutage of two iiue' gas outlets; -Furtherniore; my boiler hasa much larges. direot-y heating-surface. and a smaller amount ot'furnace wa'll subjected'tothe intense heater' the tire than any otherii'ater tube boileryet invented'whieh has onlyv a single furnace' v:inulone Hue out-let.

l claim?? f f l.. fr water tube :boiler ofthe shaped.V

157W 4having' af-furnace and' combustion chamber at' the. front. end:A apair. of. spaced' transverse steam fand water. drums, 'sai-d "leachother by an upper bant;` i-- steanitubes anda lower baul; ofw'ate'rttiibesq a pair of t lower spaced. front andv rear nf'aterdrunisf" each-'of saidwater drums bein-g connected by' separa-te banksof -t'ubes to 4one offthe afoi'esaidsteam and-'water druinsdn su'c'hspa-ee, and' thfel-'rear water drum-being 'also connected by anotherseparate 4bank of tubes to the rear steam and water druni in such manneras 'to ineiose a "if shaped superheater space-'substantially asdescribed. v

2.-- A. water' tube-boiler or" the. iii shaped type having a. furnace'wall and a combustion eliamberat' the 'liront end thereo, al pair ofspaeedtransverse steam and water drumst said steam r and Water drumsbeing connected to eali otherby an upper bank of steam drums', eachGif-said Water drumsbeing connleeted, by s parate. otubes to 'the frontsteam-and Water, drum-1in such inanner esto" inelose an LAshape'c'-urnaee space.

irland the rear water drinn beineal'so oonneet- L. d A a *1t- Q1" ef edby another separate-banlnof tubesto the rear si arnaud Waterudrurninrsuch manner -as to, :u 'ielosev ab sliapedsuperheater space,

.of tubes. tozlth'e rearV steam and and .al'bat'tle'" wall separatingthe aforesaid scribed.

,t'eain and water drun'iS substantially as desteam'v and water drum,a-banlr of tubes lonpla'eed transijersely between said tubes and saidbaiiieplate'and iyall. 4f. .A steam boiler 'Compri-'sing a walL twoupper steam and water drumsJ a large lower drum .tov said steam 'andAWater drums forming. a" lf'i shaped' superheater space therebetween,a-.s'niall lower, water'- drum;- ro-ws of vinclined tubes positionedadjacent 'to the'. front wall' oi" theg-bo'iler' andl and the other oneor" said steam and water cruinsA -a battle plate longitudinallyposieinen..

GERGE KU Witnesses fr 't9-Aminraisons7 B. CRAIG.

' a feed'fand lwater drain-connected by banks i ter drinny lianltfot`tubesfifrj-o1n that ban-lief 'tubeseonL neetin'g the rear water drum tothe rear extending longitudinally' thereof 'substany tially the entirelength of said bank O tubes with a row-ot said tubes positioned betweenConnecting'-saidsnialler lower wate drum tioned betweenl saidtubes-n-with one row of tubes between said batiie and the boiler fronttubes and a lower bank of. water tubes, av. pair ot'plowerfspaoed' frontand rear watery" yliiwater tube boiler eonprising a'wall, 1 lower Airontwater druna,y an upper frontA 9G git'udinallypositioned adjacent saidwall and connecting said drums7 a baiii'e plate' 'stantially verticalpipes connecting saidfeed.

